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If you're worried about the car battery dying while your carPC is running from it, it seems to me it might make more sense to just buy a car battery charger. For not too much money you should be able to find one that is smart enough to switch between full charge and trickle mode so it automatically charges the battery properly all the time.
Car batteries are pretty rugged, and generally should charge and be just fine with a 13.8V supply hooked up. However, without actually trying it, it's difficult to say if your supply would be OK with it - if the battery was discharged a bit, it could try to draw a huge current from the power supply at first - the power supply voltage might just droop a bit under the load, or it might just shut off, or it might even damage it, depending on how the supply is designed.
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But don't take it from me! here's a quote from a real, live newbie:
Quote: Originally Posted by Viscouse
I am learning buttloads just by searching on this forum. I've learned 2 big things so far: 1-it's been done before, and 2-if it hasn't, there is a way to do it.
eegeek.net
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